Like all legislation, if they propose legislation they should make sure that it would have prevented the incident if it had been in place before the incident . Most legislation don't even come close. The so called assault weapon ban sure ddnt,

People shouldn't propose legislation that will cut off millions of people' freedom on a knee jerk response to a tragedy that wouldn't have been prevented if the legislation had been in place before.

If we don't count our blessings
We are just wasting our time